Note
As you've noted, that website is no longer being updated. Beyond the reasons on my end (I no longer work with Rust, and my time is allocated elsewhere), I also feel that (1) yes, we are IDE, and (2) virtually every editor now maintains its own plugin listing---which wasn't necessarily the case when this page started. A huge "thank you" to everyone who contributed while areweideyet lasted!
This aims to be an overview over the ecosystem of editors and IDEs for Rust coding.
Open an issue in the issue tracker,
write me in IRC (same nickname),
or fork the repository, edit and compile index.jade to check if it works, and send a pull request.
I've chosen the CC-by licence, as it seemed to be the most permissive and appropriate one.